linux-kernel - Re: [PATCH 2/2] arm: mvebu: Add hardware I/O Coherency support

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Date:	Wed, 24 Oct 2012 13:53:28 +0200
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Lior Amsalem <alior@...vell.com>, Andrew Lunn <andrew@...n.ch>,
	Ike Pan <ike.pan@...onical.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Ian Molton <ian.molton@...ethink.co.uk>,
	David Marlin <dmarlin@...hat.com>,
	Yehuda Yitschak <yehuday@...vell.com>,
	Jani Monoses <jani.monoses@...onical.com>,
	Russell King <linux@....linux.org.uk>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Dan Frazier <dann.frazier@...onical.com>,
	Eran Ben-Avi <benavi@...vell.com>,
	Leif Lindholm <leif.lindholm@....com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Jason Cooper <jason@...edaemon.net>,
	Jon Masters <jcm@...hat.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Ben Dooks <ben-linux@...ff.org>,
	linux-arm-kernel@...ts.infradead.org,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Chris Van Hoof <vanhoof@...onical.com>,
	Nicolas Pitre <nico@...xnic.net>, linux-kernel@...r.kernel.org,
	Maen Suleiman <maen@...vell.com>,
	Shadi Ammouri <shadi@...vell.com>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH 2/2] arm: mvebu: Add hardware I/O Coherency support

On 10/24/2012 01:48 PM, Gregory CLEMENT wrote:
> On 10/24/2012 01:36 PM, Arnd Bergmann wrote:
>> On Wednesday 24 October 2012, Gregory CLEMENT wrote:
>>> +void __init armada_370_xp_coherency_iocache_init(void)
>>> +{
>>> +       /* When the coherency fabric is available, the Armada XP and
>>> +        * Aramada 370 are close to a coherent architecture, so we based
>>> +        * our dma ops on the coherent one, and just changes the
>>> +        * operations which need a arch io sync */
>>> +       if (of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric")) {
>>> +               struct dma_map_ops *dma_ops = &armada_xp_dma_ops;
>>> +               memcpy(dma_ops, &arm_coherent_dma_ops, sizeof(*dma_ops));
>>> +               dma_ops->map_page = armada_xp_dma_map_page;
>>> +               dma_ops->unmap_page = armada_xp_dma_unmap_page;
>>> +               dma_ops->unmap_sg = arm_dma_ops.unmap_sg;
>>> +               dma_ops->sync_single_for_cpu = armada_xp_dma_sync;
>>> +               dma_ops->sync_single_for_device = armada_xp_dma_sync;
>>> +               dma_ops->sync_sg_for_cpu = arm_dma_ops.sync_sg_for_cpu;
>>> +               dma_ops->sync_sg_for_device = arm_dma_ops.sync_sg_for_device;
>>> +       }
>>> +       bus_register_notifier(&platform_bus_type, &armada_xp_platform_nb);
>>
>> I think it would be cleaner to statically define the operations in a constant
>> structure and point directly to the functions you need. If necessary, use
>> multiple structures.
> 
> My problem was that these functions are not exposed, only arm_dma_op and
> arm_coherent_dma_ops are exported.
> Or do you think about something like this:
> 
> struct dma_map_ops *dma_ops = {
> 	.alloc			= arm_dma_ops.arm_coherent_dma_alloc,
> 	.free			= arm_dma_ops.arm_coherent_dma_free,
> 	.mmap			= arm_dma_ops.arm_dma_mmap,
> 	.get_sgtable		= arm_dma_ops.arm_dma_get_sgtable,
> 	.map_sg			= arm_dma_ops.arm_dma_map_sg,
> 	.set_dma_mask		= arm_dma_ops.arm_dma_set_mask,
> 	.map_page 		= armada_xp_dma_map_page,
> 	.unmap_page 		= armada_xp_dma_unmap_page,
> 	.unmap_sg 		= arm_dma_ops.unmap_sg,
> 	.sync_single_for_cpu 	= armada_xp_dma_sync,
> 	.sync_single_for_device = armada_xp_dma_sync,
> 	.sync_sg_for_cpu 	= arm_dma_ops.sync_sg_for_cpu,
> 	.sync_sg_for_device	= arm_dma_ops.sync_sg_for_device,
> };

I was too fast to reply this struct is wrong, it should be as this one:

struct dma_map_ops *dma_ops = {
	.alloc			= arm_coherent_dma_ops.arm_coherent_dma_alloc,
	.free			= arm_coherent_dma_ops.arm_coherent_dma_free,
	.mmap			= arm_coherent_dma_ops.arm_dma_mmap,
	.get_sgtable		= arm_coherent_dma_ops.arm_dma_get_sgtable,
	.map_sg			= arm_coherent_dma_ops.arm_dma_map_sg,
	.set_dma_mask		= arm_coherent_dma_ops.arm_dma_set_mask,
	.map_page 		= armada_xp_dma_map_page,
	.unmap_page 		= armada_xp_dma_unmap_page,
	.unmap_sg 		= arm_dma_ops.unmap_sg,
	.sync_single_for_cpu 	= armada_xp_dma_sync,
	.sync_single_for_device = armada_xp_dma_sync,
	.sync_sg_for_cpu 	= arm_dma_ops.sync_sg_for_cpu,
	.sync_sg_for_device 	= arm_dma_ops.sync_sg_for_device,
};

Thanks,
Gregory
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